I was wondering if i can generate high frequency pulses using this for using it in many of my projects.
Any suggestions?

 

Yes, you could build a high frequency pulse generator but what would the earphone jack of your phone do? Please be a little more specific so that we can make reasonable suggestions.
Regards,
Keith

 

Sorry for that,
basically i want to play a high frequency sound on my phone and than connect the wires from earphone that goes to the speaker to the input of my transistor switch.
I want to do this so that i cant change the frequency easily and to a wider range.

 

You can do it with a PC - free software.
https://www.nch.com.au/tonegen/index.html

 

Sorry for that,
basically i want to play a high frequency sound on my phone and than connect the wires from earphone that goes to the speaker to the input of my transistor switch.
I want to do this so that i cant change the frequency easily and to a wider range.

I still do not understand what you are asking.
Do you have an application on your phone that you can generate the high frequency signals and output them to your earphone jack?
If you do, then you should be able to connect that to whatever your switch is. What exactly are you asking?

 

I was wondering if i can generate high frequency pulses using this for using it in many of my projects

I'll play The devil's advocate.
Only because you Incorporated a transistor as a switch which could easily be an amplifier and would blow! not only your headphone but your eardrum or someone else's eardrum.(danger Will Robinson... Danger)

 

That is a great way to damage your phone beyond any hope of repair!

 

When you say high frequency, what kind of frequencies do you have in mind? The headphone output was probably designed to cover up to 20kHz at most. Many audio circuits are spec'd lower as a cost saving measure.